These exhaust springs are perfect for those looking to upgrade their bike parts. With a length of 80mm, they are ideal for pre-65 and twinshock models. The manufacturer part number is UNI-O1, ensuring their quality and reliability. These springs are designed to provide a secure and stable attachment for your exhaust system. They are suitable for both trials and motocross bikes, making them a versatile option for any rider. Upgrade your ride with these high-quality exhaust springs today!